My preferred way of removing paint on my project bikes is mechanically via angle grinder accessories. Watch me demonstrate the quickest way of stripping paint that I have learnt:
Accessories to remove paint:
Wire wheels:
4″ wire wheel: http://amzn.to/2jLZoiV
Strip and clean discs:
4.5″ strip and clean disc (Norton): http://amzn.to/2jLZ18l
4.5″ strip and clean disc (3M – proprietary adaptor for angle grinder required): http://amzn.to/2kdIQ0b